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How to Disable CHARGEN on Your Server

CHARGEN-exploited DDoS attacks use a flawed and outdated testing/debugging protocol that has not been removed from most operating systems. Disabling CHARGEN stops a server from being misused by an attacker.

DIFFICULTY

Basic - 1 | Medium - 2 | Advanced - 3

TIME REQUIRED

15-30 min

RELATED PRODUCTS

VPS or dedicated servers

Windows-based Servers

From the cmd prompt (run as Administrator on Windows Server 2012), run:

Linux Server

Edit the file to include (add if not there already) under the Environmental options header:

enabled = chargen-stream

Remember to restart the xinetd service:

service xinetd restart

You may also find this same line in other files of /etc/xinetd.d/

As CHARGEN can be re-enabled through a simple reversal of these steps a simple malicious script could be used to again open up a server for exploit. Please refer to our other server security articles for steps and tips to reducing the chances of an exploited server.